I know the YZ 125 doesn't change in 2008, just some details like the brakes but I'm wondering if they are going to make a 144 for 2009. In many country you can race a 144 factory and maybe the rule will change for the USA... It's a stupid decision which doesn't mean anything...
About the 144 SX, 2008 is the first year of a mass production, the 2007 model seemed to be like a "pre production", impossible to find in Europe...
If the 144 SX is well sold, japanese manufacturers could make a 144 cc... TM has made one too.